Comparison 1. Asthma ‐ low sodium diet (LSD) vs higher sodium diet (HSD).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 FEV1 (litres)	3		Mean Difference (Random, 95% CI)	0.12 [‐0.02, 0.26]
2 FEV1/FVC (%)	2		Mean Difference (Random, 95% CI)	0.62 [‐2.98, 4.21]
3 PEFR (litres/min)	3		Mean Difference (Random, 95% CI)	11.01 [‐12.67, 34.70]
4 Bronchodilator usage (puffs/day)	3		Mean Difference (Random, 95% CI)	‐0.03 [‐0.18, 0.12]
5 Sodium excretion (mmol/L)	4		Mean Difference (Random, 95% CI)	Totals not selected